Related by context. Frequent words. (Click for all words.) 79 GHG emissions 78 greenhouse gasses 78 greenhouse gases 76 GHG 75 greenhouse gas 75 greenhouse gas emissions 73 emissions 73 carbon dioxide emissions 71 carbon emissions 70 CO2 70 CO2 emissions 69 greenhouse emissions 68 greenhouse gas emission 68 carbon dioxide 67 carbon emission 66 Emissions 65 emission 65 emission reductions 64 carbon dioxide CO2 61 emission reduction 61 heat trapping gases 61 pollutant 60 tailpipe emissions 60 global warming gases 59 nitrogen oxide 59 NOx 59 mercury emissions 58 pollutants 58 reducing carbon emissions 57 reduce carbon emissions 57 sulfur dioxide emissions 56 carbon 56 nitrogen oxides 56 pollution 55 air pollution 54 exhaust emissions 54 fossil fuels 53 fossil fuel 53 methane 53 burning fossil fuels 53 sulfur dioxide 52 atmospheric carbon dioxide 52 Carbon dioxide 51 mercury pollution 51 particulate matter 51 VOCs 51 emitters 51 global warming 50 climate change 50 gases 50 carbon footprint 49 carbon footprints 49 CFCs 49 regulate greenhouse gases 48 ozone 48 polluter 47 gasses 47 acid rain 46 particulates 46 renewables 46 Clean Air 46 polluters 46 EPA 46 Methane 46 Kyoto Protocol 46 RGGI 45 volatile organic compounds 45 carbon sequestration 45 Kyoto accord 45 Montreal Protocol 45 CARB 45 combustion 45 water vapor 45 biomass 44 Climate Change 44 ecological footprint 44 biofuels 44 gases blamed 44 reduce greenhouse gas 44 carbon capture 44 aerosols 43 carbon credits 43 CO 43 environmental impacts 43 emitted 43 renewable energy 43 polluting 43 carbon offsets 43 carbon neutral 43 reducing greenhouse gas 43 renewable fuels 42 Global Warming 42 polluting industries 42 emitting 41 combustion engine 41 biofuel 41 renewable 41 internal combustion engines 41 internal combustion engine 41 renewable energies 41 coal fired